Work holding means for turning machines



Oct. 25, 1932. c. H. LANDERS 1,883,977

WORK HOLDING MEANS FOR TURNING MACHINES Original Filed Jan. 3. 1928attouwid ,I I I 'I I I I I y k* I I I III I III s A U C@ I I l* I IIIIII I I III I s `III I I t, II f I I 'I I Q k; -II

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m In: i Invnkoz Q III I CZaf/eJ/mfrrf II if M^ Y 51:'.` MMKWM PatentedOct. 25, 1932 UNITED STATES PATENT OFFICE CHARLES H. LANDERS, OFLANSING, MICHIGAN, ASSIGNOR TO GENERAL MOTORS CORPORATION, OF DETROIT,MICHIGAN, A CORPORATION OF DELAWARE WORK HOLDING MEALN S FOR TURNINGMACHINES Original application filed January 23, 1928, Serial No.248,842. Divided and this application led November 20, 1929.

This invention relates to the manufacture of bearings, and thisapplication is concerned particularly with the structure of an outsideturning machine such as disclosed in my prior application, S. N.248,842, filed January 23, 1928, of which this is a division. Thevarious operations in the process of making bearings prior to andsubsequent to the outside turning, as fully disclosed in my prior filed'application, form no part of the present invention and are not includedherein.

The machine for outside turning is so constructed as to clamp a pair ofbearing halves for application of the turning tool to the eX- teriorsthereof. More specifically a pair of bearing halves is clamped betweentwo cuplike members having clamping surfaces engaging the chamfered endsof the bearings.

One of the main objects of my invention is to so mount said clampingelements as to hold the bearing halves firmly in place during theturning operation, and providing a quick, yet positive, readilycontrolled means for moving one of said clamping elements toward andaway from the other to facilitate the removal of the turned bearinghalves and replacement by unturned halves. It will be understood that agrinding wheel may be employed instead of a turning tool, which latter Iprefer because turning is sufficiently accurate and may be more quicklyaccomplished than grinding.

In the drawing:

Figure 1 is a side elevation of the turning machine, and Figure 2 is aplan view with parts shown in section.

The turning machine is provided with a bed plate 134 upon which ismounted a cutter 136 adapted to be moved along the work either manuallyor automatically. The mounting of the cutter on the bed plate whichsupports the clamping members and associated elements insures accuratepositioning of the bearing halves relative thereto during the cuttingoperation.

The bearing halves 10 are mounted on a revolving shaft 138 driven by anysuitable means and provided with a clamping collar 140 having a bevelledsurface 142 for engaging the similarly bevelled surfaces on one SerialNo. 408,496.

end of said bearing halves 10. The corresponding surfaces at the otherend of said bearings are engaged by a bevelled surface 144 carried bythe sliding clamp 146 normally urged away from the bearings by the coilispring 148, as shown. The shaft 138 is hollow and within it reciprocatesram 150 which is provided at one end with wedges 152 for engaging theclamping member 146 and locking it against the bearings 10, whichwedgesl0 operate in slots in the shaft 138. At its other end, the ram150 is provided with a piston 153 operating in a suitable cylinder andadapted preferably to be actuated by air pressure to effect movement ofthe clampingmember 146 into engagement with the bearings 10. The freeend of the shaft 138`is engaged by a pilot bearing 154, preferablymounted on anti-friction bearings and serv-l ing to prevent flexing ofthe shaft such asfwould' cause inaccuracy of the cut.

In operation the ram 150 is moved to the right carrying with it thewedges 152 and releasing the clamping member 146 which is moved by thespring 148 to the right. A 75 pair of bearing halves are then insertedaround the shaft 138 and the ram 150 moved to the left clamping saidbearing halves in position between the collar 140 and clamping member146. The cooperating bevelledso surfaces on the bearing halves andclamping elements serve to position such bearings with respect to thecutter 136 and concentrically with the shaft 138. The shaft 138 is thenrotated and after moving the cutter 85 136 along the bearing, theoperations above set forth are repeated replacing the turned bearinghalves with unturned bearings.

It will be seen that my turning machine is positive in its action,providing for bothaccuracy and expediency in turning the bearing halvesfor which it is particularly designed. Various nses for the clampingmeans forming a part of my invention will suggest themselves within thescope thereof.

I claim:

1. A holding means for bearing segments or the like including a hollowshaft, a relatively flxed clamping collar thereon, a rela.- tivelymovable clamping member thereon,`

spring means housed within said clamping member normally urging the sameaway from the clamping collar, and lluid pressure operated meansincluding a passing imthrough said hollow shaft and provided withelements engaging an end of said clamping member to move it toward theclamping collar, adapted to thereby retain bearing segments between saidclamping elements. J0. 2. A holding means for bearing segments or thelike comprising a relatively fixed clamping collar, a relatively movableclamping member, a spring housed within said movable clamping member andurging said 5. clamping member away from said clamping collar, and meanscooperating with said clamping member and operableby fluid pressure inone direction to positively move said clamping member toward saidclamping colsola-rand in the other direction to permit said spring tomove said clamping member away from said clamping collar.

3. A holdin@ means for bearing segments or the like, including a hollowshaft, a rela ,g5 tively fixed clamping collar Jthereon, a relativelymovable clamping member thereon, and means for moving said clamping memyber toward and away from said clamping collar Comprising a ram slidablyVmounted in said hollow shaft and provided with elements engaging saidclamping member to move it toward said clamping collar, and a springengaging said Clamping memberto move it away from said elampingcolla'r,said spring being positioned betweensaid clamping member and an abutmenton said hollow shaft so that it urges said clamping member away fromsaid clamping collar independently of said ram. Y

4. A holding means for bearing segments or Ithe like, including a hollowshaft, a relatively iixed Clamping Collar thereon, a relatively movableclamping member thereon, spring means constantly urging said clamp- 5ing member away from said Clamping collar, a fluid pressure operatedmeans including a ram slidably mounted within said hollow shaft,elements secured to an end of said ram extending through longitudinalslots y in said hollow shaft to engage an end of said clamping member tomove it toward said clamping collar, and a pilot bearing engaging theadjacent free end of said hollow shaft to prevent flexing thereof.

In testimony whereo1 I alix my signature.

Gli-IAS. H. LANDERS.

